Ytong or aerated concrete is a porous, lightweight insulating building material; it consists primarily of sand, cement, lime and water.
Aerated concrete may no longer be deposited in a class III landfill because this material contains sulphates that can leach into the groundwater. The leaching can however be limited by binding the sulphate.
Aerated concrete that is clean and collected on worksites can be reused as raw material for producing new aerated concrete. It is ground into granules or powders at recycling companies.
These recycling products are used as screed mixtures as a replacement for sand and granules and are used for insulating screed or insulating filler.